POLARIZED UV-ABSORPTION SPECTRA OF RETINAL ISOMERS—II. ON THE ASSIGNMENT OF THE LOW AND HIGH ENERGY ABSORPTION BANDS

1984 ◽  
Vol 40 (1) ◽  
pp. 93-104 ◽  
Author(s):  
G. Drikos ◽  
H. Rüppel
Keyword(s):  
Energy Absorption ◽  
Absorption Spectra ◽  
High Energy ◽  
Uv Absorption ◽  
Absorption Bands ◽  
Uv Absorption Spectra ◽  
High Energy Absorption ◽  
Retinal Isomers

Peculiarities of the manifestation of the K absorption bands in the UV absorption spectra of azomethine bases

1977 ◽  
Vol 13 (8) ◽  
pp. 837-840
Author(s):  
V. I. Pavskii ◽  
N. A. Kabo ◽  
A. E. Lipkin ◽  
V. A. Terent'ev
Keyword(s):  
Absorption Spectra ◽  
Uv Absorption ◽  
Absorption Bands ◽  
Uv Absorption Spectra

scholarly journals Contribution of the Walsh Orbitals to the Excited States of Conjugated Cyclopropyl Molecules (A PMO Treatment)

1976 ◽  
Vol 31 (5) ◽  
pp. 488-493
Author(s):  
Muthana Shanshal
Keyword(s):  
Absorption Spectra ◽  
Molecular Orbital ◽  
Excited States ◽  
Uv Absorption ◽  
Order Perturbation ◽  
Absorption Bands ◽  
Uv Absorption Spectra ◽  
Orbital Energies ◽  
Walsh Orbitals

Abstract The molecular orbital energies of some conjugated cyclopropyl derivatives are evaluated using 2nd order perturbation. The basis includes the Hückel MOs of the conjugated segment and the Walsh MOs of cyclopropane. The obtained MO sequence is used to discuss the UV absorption spectra of the molecules. It is found that the absorption bands of most of these molecules correspond to Δ-π* or Δ-Δ* excitations and not to π-π* transitions as had been assumed.

Simulation of UV Absorption Spectra and Relaxation Dynamics of Uracil and Uracil-Water Clusters

2020 ◽  
Author(s):  
Branislav Milovanović ◽  
Jurica Novak ◽  
Mihajlo Etinski ◽  
Wolfgang Domcke ◽  
Nadja Doslic
Keyword(s):  
Aqueous Solution ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Absorption Spectroscopy ◽  
Water Clusters ◽  
Uv Absorption ◽  
Relaxation Dynamics ◽  
Nonradiative Relaxation ◽  
Uv Absorption Spectra ◽  
Uv Absorption Spectroscopy

Despite many studies, the mechanisms of nonradiative relaxation of uracil in the gas phase and in aqueous solution are still not fully resolved. Here we combine theoretical UV absorption spectroscopy...

scholarly journals UV-Absorption Spectra of Complexes Between Some Disulfides and Iodine. I.

1969 ◽  
Vol 23 ◽  
pp. 2127-2135 ◽  
Author(s):  
Bengt Nelander ◽  
G. Hagen ◽  
Seija Vesala ◽  
Tarja Aalto ◽  
Per-Erik Werner ◽  
...  
Keyword(s):  
Absorption Spectra ◽  
Uv Absorption ◽  
Uv Absorption Spectra

UV and IR Spectral Characteristics of Chloramben in Selected Environments

Weed Science ◽  
1976 ◽  
Vol 24 (1) ◽  
pp. 107-114 ◽  
Author(s):  
V. E. Berkheiser ◽  
J. L. Ahlrichs
Keyword(s):  
Ir Spectra ◽  
Water Content ◽  
Absorption Spectra ◽  
Spectral Characteristics ◽  
Uv Absorption ◽  
Hydration Water ◽  
Carboxyl Group ◽  
Amino Group ◽  
Acid Base ◽  
Uv Absorption Spectra

Ultraviolet (UV) absorption spectra were recorded of chloramben (3-amino-2,5-dichlorobenzoic acid) and selected relatives in solutions of different pH's. From these spectra, the Broensted acid-base properties of chloramben were deduced. Interpretations of solution spectra were applied to UV absorption spectra of chloramben adsorbed onto Ca-montmorillonite at low water content. Infrared (IR) transmittance spectra were recorded of chloramben and selected derivatives in KBr pellets and band assignments were made. Interpretations of these spectra were also applied to IR spectra of chloramben adsorbed onto Ca-montmorillonite at low water content. Both UV and IR measurements indicated that protonation of the amino group occurs and that the carboxyl group of chloramben is strongly hydrogen-bonded to the hydration water of the interlayer cations.

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